/*
 * css/unit-engine.css — Sept 2026: extracted from a <style> block that was
 * duplicated byte-for-byte inline in 16 *Unit*.html pages (HLAAUnit1-5,
 * HLAIUnit1-5, SLAAUnit1-5, SLAIUnit1 — ~16.5KB each, ~264KB total). As
 * inline CSS it couldn't be cached across unit-to-unit navigation, which is
 * the single most common flow on these pages. Now fetched once and reused.
 *
 * SLAIUnit2-5 have their own, separately-evolved style blocks (not a clean
 * superset of this one) and were deliberately left alone rather than risking
 * a visual regression for a smaller win.
 */
        :root {
            --primary-green: #0d3d8f;
            --light-green: #e6ecf7;
            --emerald-accent: #062559;
            --dark-gray: #333333;
            --border-color: #cccccc;
            --shadow: 0 4px 6px rgba(0,0,0,0.1);
            --mark-red: #c62828;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            margin: 0;
            padding: 15px;
            background-color: #f9f9f9;
            color: var(--dark-gray);
        }

        .dashboard-container {
            max-width: 1200px;
            margin: 0 auto;
            background: #ffffff;
            border-radius: 8px;
            box-shadow: var(--shadow);
            padding: 20px;
        }

        h1, h2 {
            color: var(--primary-green);
            margin-top: 0;
            font-size: 1.65rem;
            border-bottom: 2px solid var(--primary-green);
            padding-bottom: 8px;
        }

        .controls-grid {
            display: grid;
            grid-template-columns: minmax(300px, 1.7fr) minmax(180px, 1fr) minmax(180px, 1fr);
            gap: 22px 24px;
            background: var(--light-green);
            padding: 22px 24px;
            border-radius: 8px;
            margin-bottom: 28px;
            align-items: start;
        }
        .controls-grid .control-group--full {
            grid-column: 1 / -1;
            margin-top: 4px;
        }
        @media (max-width: 760px) {
            .controls-grid { grid-template-columns: 1fr; gap: 14px; padding: 18px; }
        }

        .control-group {
            display: flex;
            flex-direction: column;
        }

        .control-group label {
            font-weight: bold;
            margin-bottom: 8px;
            color: var(--emerald-accent);
            font-size: 0.92rem;
            text-transform: uppercase;
            letter-spacing: 0.4px;
        }

        select, button {
            padding: 10px;
            border-radius: 4px;
            border: 1px solid var(--border-color);
            font-size: 1rem;
        }

        select {
            background-color: #ffffff;
        }

        /* Multi-select check box list container layouts */
        .checkbox-dropdown-list {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 12px 14px;
            max-height: 220px;
            min-height: 180px;
            overflow-y: auto;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .checkbox-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.95rem;
            cursor: pointer;
            user-select: none;
        }

        .checkbox-item input {
            cursor: pointer;
            width: 16px;
            height: 16px;
            accent-color: var(--primary-green);
        }

        .btn-generate {
            background-color: var(--primary-green);
            color: #ffffff;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background 0.2s ease, transform 0.15s ease;
            height: 52px;
            font-size: 1.05rem;
            letter-spacing: 0.4px;
            border-radius: 6px;
            box-shadow: 0 2px 4px rgba(13, 61, 143, 0.25);
        }
        .btn-generate:active { transform: translateY(1px); }

        .btn-generate:hover {
            background-color: var(--emerald-accent);
        }

        .worksheet-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        .question-card {
            border: 1px solid var(--border-color);
            border-left: 5px solid var(--primary-green);
            background: #ffffff;
            border-radius: 6px;
            padding: 20px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            position: relative;
        }

        .card-meta {
            display: flex;
            justify-content: space-between;
            font-size: 0.85rem;
            color: #666666;
            margin-bottom: 12px;
            background: #f5f5f5;
            padding: 5px 10px;
            border-radius: 4px;
        }

        .card-prompt {
            font-size: 1.1rem;
            line-height: 1.6;
            margin-bottom: 20px;
        }

        .workspace-split {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 15px;
            margin-top: 15px;
            align-items: stretch;
        }
        .workspace-split > .drop-zone { min-height: 140px; }
        .workspace-actions {
            display: flex; flex-direction: column; gap: 10px;
            justify-content: flex-start;
        }
        .scheme-panel {
            grid-column: 1 / -1;
            margin-top: 4px;
        }

        .drop-zone {
            border: 2px dashed var(--primary-green);
            background: var(--light-green);
            border-radius: 6px;
            padding: 20px;
            text-align: center;
            cursor: pointer;
            transition: background 0.2s ease;
        }

        .drop-zone.dragover {
            background: #c9d8f0;
        }

        .drop-zone p {
            margin: 0;
            font-size: 0.9rem;
            color: var(--emerald-accent);
        }

        .preview-img {
            max-width: 100%;
            max-height: 150px;
            margin-top: 10px;
            border-radius: 4px;
            display: none;
        }

        .action-buttons {
            display: flex;
            gap: 10px;
            margin-top: 10px;
        }

        .btn-secondary {
            background: #666666;
            color: white;
            border: none;
            cursor: pointer;
            flex: 1;
        }

        .btn-action {
            background: var(--emerald-accent);
            color: white;
            border: none;
            cursor: pointer;
            flex: 1;
        }

        .scheme-panel {
            background: #fafafa;
            border: 1px solid #e0e0e0;
            border-top: 3px solid #0d3d8f;
            border-radius: 4px;
            padding: 20px;
            margin-top: 15px;
            display: none;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            font-size: 1.05rem;
            line-height: 1.6;
            color: #333333;
            position: relative;
            overflow: hidden;
            z-index: 1;
        }
        .scheme-header {
            font-weight: bold;
            color: var(--primary-green);
            font-size: 1.05rem;
            text-transform: uppercase;
            letter-spacing: 1.2px;
            border-bottom: 2px solid var(--primary-green);
            padding-bottom: 8px;
            margin-bottom: 14px;
            position: relative;
            z-index: 1;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .scheme-header::before {
            content: "▸";
            color: var(--primary-green);
            font-size: 1.1rem;
            line-height: 1;
        }

        
.watermark-layer {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 0;
    user-select: none;
    filter: grayscale(100%);
    display: none;
}

.question-card .watermark-layer {
    width: 150px;
    height: auto;
    opacity: 0.09;
}

.scheme-panel .watermark-layer {
    width: 130px;
    height: auto;
    opacity: 0.07;
}

.watermark-visible {
    display: block !important;
}


        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.5);
            align-items: center;
            justify-content: center;
        }

        .modal-content {
            background-color: #ffffff;
            padding: 25px;
            border-radius: 8px;
            max-width: 750px;
            width: 90%;
            max-height: 85vh;
            overflow-y: auto;
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
            position: relative;
        }

        .close-modal {
            position: absolute;
            top: 15px;
            right: 20px;
            font-size: 1.5rem;
            cursor: pointer;
            color: #aaa;
        }

        .close-modal:hover {
            color: #333;
        }

        .score-callout {
            background-color: var(--light-green);
            border-left: 5px solid var(--primary-green);
            padding: 12px 15px;
            font-size: 1.25rem;
            font-weight: bold;
            color: var(--emerald-accent);
            margin: 15px 0;
            border-radius: 4px;
        }

        .ai-feedback-text {
            line-height: 1.6;
            font-size: 1.05rem;
        }

        .spinner {
            display: none;
            border: 4px solid rgba(0,0,0,0.1);
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border-left-color: var(--primary-green);
            animation: spin 1s linear infinite;
            margin: 10px auto;
        }

        @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
    
        /* ---- Firebase Auth bar + Progress modal (added by setup script) ---- */
        .auth-bar {
            background: #ffffff;
            border: 1px solid #e0e0e0;
            border-radius: 8px;
            padding: 10px 18px;
            display: flex;
            align-items: center;
            justify-content: flex-end;
            gap: 12px;
            font-size: 0.9rem;
            margin: 0 auto 16px auto;
            max-width: 1200px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.04);
        }
        .auth-bar #auth-status {
            color: #555;
            flex: 1;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .auth-bar #auth-status .avatar {
            width: 26px;
            height: 26px;
            border-radius: 50%;
            object-fit: cover;
        }
        .auth-bar button {
            padding: 7px 16px;
            font-size: 0.85rem;
            font-weight: 600;
            border: 1px solid #0d3d8f;
            background: #ffffff;
            color: #0d3d8f;
            border-radius: 5px;
            cursor: pointer;
            transition: background 0.15s ease;
        }
        .auth-bar button:hover { background: #e6ecf7; }
        .auth-bar #auth-action-btn[data-state="in"] { color: #c62828; border-color: #c62828; }
        .auth-bar #auth-action-btn[data-state="in"]:hover { background: #ffebee; }
        .auth-bar #progress-btn { background: #0d3d8f; color: #ffffff; border-color: #0d3d8f; }
        .auth-bar #progress-btn:hover { background: #062559; }

        #progress-modal { display: none; position: fixed; z-index: 1500; inset: 0; background: rgba(0,0,0,0.55); align-items: center; justify-content: center; }
        #progress-modal .panel { background: #ffffff; max-width: 780px; width: 92%; max-height: 86vh; overflow-y: auto; border-radius: 10px; padding: 24px 28px; position: relative; }
        #progress-modal h3 { color: #0d3d8f; margin: 0 0 8px 0; }
        #progress-modal .summary-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 14px 0 22px 0; }
        #progress-modal .summary-card { background: #e6ecf7; border-radius: 6px; padding: 14px 10px; text-align: center; }
        #progress-modal .summary-card .num { font-size: 1.7rem; font-weight: bold; color: #062559; line-height: 1.1; }
        #progress-modal .summary-card .lbl { font-size: 0.75rem; color: #555; text-transform: uppercase; letter-spacing: 0.6px; margin-top: 4px; }
        #progress-modal table { width: 100%; border-collapse: collapse; font-size: 0.9rem; margin-top: 6px; }
        #progress-modal th, #progress-modal td { padding: 8px 10px; border-bottom: 1px solid #e0e0e0; text-align: left; }
        #progress-modal th { background: #f5f5f5; color: #062559; font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.4px; }
        #progress-modal .close-progress { position: absolute; top: 14px; right: 18px; cursor: pointer; color: #888; font-size: 1.6rem; line-height: 1; }
        #progress-modal h4 { color: #062559; margin: 20px 0 6px 0; font-size: 0.95rem; }

        .self-rating {
            display: flex; align-items: center; gap: 10px;
            margin-top: 16px; padding-top: 14px;
            border-top: 1px dashed #cccccc;
            flex-wrap: wrap; position: relative; z-index: 1;
        }
        .self-rating > span:first-child {
            font-weight: 600; color: #062559; font-size: 0.92rem;
        }
        .self-rating button {
            padding: 6px 14px; font-size: 0.9rem; border-radius: 5px;
            border: 1px solid #0d3d8f; background: #ffffff; color: #0d3d8f;
            cursor: pointer; transition: background 0.15s ease;
        }
        .self-rating button.rate-good:hover { background: #e6ecf7; }
        .self-rating button.rate-bad { border-color: #c62828; color: #c62828; }
        .self-rating button.rate-bad:hover { background: #ffebee; }
        .self-rating .rating-status {
            font-size: 0.85rem; font-style: italic;
            flex-basis: 100%; margin-top: 4px;
        }

        .signin-hint {
            max-width: 1200px;
            margin: -8px auto 16px auto;
            padding: 0 18px;
            text-align: right;
            font-size: 0.8rem;
            color: #666;
            font-style: italic;
        }
        .signin-hint a { color: #0d3d8f; text-decoration: none; font-weight: 600; }
        .signin-hint a:hover { text-decoration: underline; }

.q-timer { background:#eef3fb; color:#0d3d8f; padding:2px 10px; border-radius:12px; font-weight:600; font-variant-numeric:tabular-nums; font-size:0.85rem; letter-spacing:0.5px; display:inline-flex; align-items:center; gap:5px; }
.q-timer::before { content:"⏱"; font-size:0.9rem; }
.q-timer.stopped { background:#e6ecf7; color:#0d3d8f; }
.q-timer.overtime { background:#ffebee; color:#c62828; }
.q-timer.hidden { display:none; }
.timer-toggle { display:flex; align-items:center; gap:8px; padding:9px 12px; border:1px solid var(--border-color, #d6dfec); border-radius:6px; background:#fff; cursor:pointer; font-size:0.92rem; color:#2a3d5e; text-transform:none; letter-spacing:0; font-weight:400; }
.timer-toggle input { margin:0; cursor:pointer; accent-color:#0d3d8f; }
.timer-toggle:hover { border-color:#0d3d8f; }

.suggested-panel { display:flex; align-items:center; gap:16px; background: linear-gradient(90deg, #eef3fb 0%, #f4f7fc 100%); border:1px solid #c9d8f0; border-left: 4px solid #0d3d8f; border-radius:10px; padding:14px 18px; margin: 0 0 22px 0; }
.suggested-panel .sp-icon { font-size:1.8rem; line-height:1; flex-shrink:0; }
.suggested-panel .sp-copy { flex-grow:1; min-width:0; }
.suggested-panel .sp-title { font-size:0.98rem; font-weight:600; color:#062559; margin-bottom:2px; }
.suggested-panel .sp-title span { color:#0d3d8f; }
.suggested-panel .sp-sub { font-size:0.82rem; color:#4a5a75; }
.suggested-panel .sp-cta { background:#0d3d8f; color:#fff; border:none; padding:10px 18px; border-radius:6px; font-weight:600; font-size:0.92rem; cursor:pointer; flex-shrink:0; transition: background 0.15s; }
.suggested-panel .sp-cta:hover { background:#062559; }
.suggested-panel .sp-dismiss { background:transparent; border:none; color:#6b7a99; font-size:1rem; cursor:pointer; padding: 6px 8px; flex-shrink:0; line-height:1; }
.suggested-panel .sp-dismiss:hover { color:#062559; }
@media (max-width: 640px) {
    .suggested-panel { flex-wrap:wrap; padding: 12px 14px; }
    .suggested-panel .sp-cta { width:100%; margin-top: 6px; }
}
    .difficulty-checkbox-group { display: flex; flex-direction: column; gap: 6px; padding: 8px 10px; border: 1px solid #cbd5e1; border-radius: 6px; background: #fff; }
    .difficulty-checkbox-group .checkbox-item { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 0.92rem; }
    .difficulty-checkbox-group input[type="checkbox"] { width: 16px; height: 16px; accent-color: #062559; }